👉 You buy . If you hit your stop loss, you lose ~$198 (within your 1% limit). Step 3: Adjusting for Different Market Conditions The 1% rule isn't rigid. Adjust based on volatility :
Kelly often gives aggressive results. Most pros use Half-Kelly (20% in this example) or less. Final Takeaway (Save This) "Position sizing is the only part of trading you can control 100%." — Unknown trader You cannot control market direction. You cannot control gaps. But you can control exactly how much you lose when you are wrong.
You can have a winning strategy (60%+ win rate) and still go broke if you get the position size wrong. Conversely, you can have a coin-flip strategy and be wildly profitable with correct position sizing. The Definitive Guide To Position Sizing Free
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f = (W × R – (1 – W)) / R *
| Account Size | Aggressive (High confidence) | Conservative (Choppy market) | | :--- | :--- | :--- | | $5,000 | 2% risk ($100) | 0.5% risk ($25) | | $25,000 | 1.5% risk ($375) | 0.75% risk ($187) | | $100,000+ | 1% risk ($1,000) | 0.25% risk ($250) |
The pros ask: "How much should I buy?"
No signup. No paywall. Just the math that keeps you in the game.
The Definitive Guide to Position Sizing (Free) Subtitle: How to calculate the exact amount to risk per trade so you never blow up your account again. Introduction: The #1 Mistake New Traders Make Most beginners ask: "What stock should I buy?" 👉 You buy
Example: 60% win rate, 2:1 reward → f = (0.6×2 – 0.4)/2 = 40%.*